The Black Cross / Red Star series of books are very good for those who want a look at the air battles in the East, along with the companion series by the same author (Bergstrom) called The Air Battles.
A dubious statement at best, given that Putin himself has been shown to be at the top of the corruption food chain, such as in the documentary below:
EDIT: http://www.pbs.org/wgbh/frontline/film/putins-way/
They've not really anything to do with the Eastern Front. The first is depicting an air raid on Ploesti and the second is just depicting an attack in the West during the winter of 44-45.